Error: "File was built for archive which is not the architecture being linked (armv7s)"

Question

I have built my own Static C++ Library, which is built with the settings:

• Architectures: armv7, armv7s
• Build Active Architectures Only: No
• Support Platforms: iOS
• Valid Architectures: armv7, armv7s

The library project builds well and I got the .a file (I have cleaned the build folder and built the project again to be sure my settings were effective).

I have added the library (.a file) to my iOS project, but the project won't build even though I have set the exact same settings on the iOS project:

• Architectures: armv7s, armv7
• Build Active Architectures Only: Yes
• Support Platforms: iOS
• Valid Architectures: armv7, armv7s

I keep getting this error:

ld: warning: ignoring file /Users/hidden/Library/Developer/Xcode/DerivedData/HelloWorldCppLib-fomvvtklwijvqicyhahxleiscein/Build/Products/Debug-iphoneos/libHelloWorldCppLib.a, file was built for archive which is not the architecture being linked (armv7s): /Users/hidden/Library/Developer/Xcode/DerivedData/HelloWorldCppLib-fomvvtklwijvqicyhahxleiscein/Build/Products/Debug-iphoneos/libHelloWorldCppLib.a

What am I missing? It tells me the .a file was not built for armv7s, but that is exactly the settings I built the library with.

Solution 1

When you're building a library you must compile it both for the simulator and the device and then merge the two outputs (.a files) into 1 library and then link it to your iOS project.

Solution 2

I ran into a similar problem myself. @graver's solution is definitely valid.

The issue was that the library was being built for armv7 instead of armv7s. You can verify this yourself by using lipo <path/to/lib.a> -info.

Setting the Build Active Architectures Only option to No fixes the issue.

Hope this helps.

Solution 3

one additional notes is:

    Build Active Architectures Only  set to no

is for the lib project.

Solution 4

I have got the exact same error when with cocapods : For me the solution was to have two differents Build Active Architecture for target and pods.

App Target :

Build Active Architectures Only  **Yes**

pods Target

Build Active Architectures Only  **No**

Solution 5

unfortunately all these pieces of advice don't work for me - Xcode 7.3.1 (7D1014), iPhone 5. but as soon as I removed all Xcode temporary files (+ restart Xcode) and rebuild again it became working.

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Comments

[ThomasCle]

That did the trick! I ran this in the terminal: lipo -create libHelloWorldCppLibPhone.a libHelloWorldCppLibSimulator.a -output libHelloWorldCppLib.a and imported the merged result to my iOS project.

[Mustafa]

@ThomasCle Thanks for sharing this awesome tip!

[ThomasCle]

I have created a script to simplify the merging process: cupcakecoding.com/coding/…

[Yoga]

This worked for me! I'm still not sure why I need to compile it for both simulator and device when I only intend to run it on the device. Anyone any ideas?

[Jinbom Heo]

Thanks! Library's 'Build Active Architectures' Release was YES, debug was NO. to YES fixed it.

[emotality]

Thank you Thomas this worked perfectly, saved me! :)

[user1105951]

thanks. that was my problem when updating SDWebImage library

[Yuri Brigance]

This solved a problem that other solutions didn't 👍

[jayant rawat]

it works wonderfully...cocoapods always come with new issues like this..

[Ryan Gross]

Note that this is in addition to everything shown in other solutions. Worked for me on a cocoapods issue.

[Native_Mobile_Arch_Dev]

Thanks! Worked like a charm.